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Home My WebLink AboutSW1210602_Plansheet - SCM Detail_20210630 (2)DocuSign Envelope ID: 61796BC1 -4762-4278-AF1 1-747CBB7384D7 0 r-i Q N 00 N 0 N N 3 W 0 0 N 0 M U U c U 'o L Q w Ln D LL PROPOSED EMERGENCY SPILLWAY PROPERTY ♦ / BOUNDARY 10' BERM ,c 1413\F LF PROPOSED 4" SLOTTED PVC/SCH 40 26 LF 0-- t w \ UNDERDRAIN (TYP.) (3,105 LF TOTAL) 31 LF 10 LF14- \ 22 LF \ 10„ LF "U w 42 LF w 10 LF 32\&LF 47 // W 10 LF �` LF � _ _ � _ _ _ 43 LF +2120� .1� w w PROPOSED 4" PVC/SCH 40 52 LF / --10 LF w_ 58 LF _ w �� 2 w .�� 10 LF w - - - CLEANOUT (TYP.) (40 TOTAL) /20 I PROPOSED I FOREBAY #5 PROPOSED CI #18 58 LF 10 LF I w " 127 LF w w I- /2Q PR( .__,___,I__,�___,_Y__,�_,______,_.0 w / 63 LF " 10 LF w " w 148 LF ` w w w ��\ (TC / _ � _ _,_� - - - -� - - - - w w TO 68 LF 10 LF i w 16-I LF " VIw\_ ` �.w_ _ _ _ _- _ 4 w w 73 LF w „10 LF - ° w 175 LF _ _ VI _ W_ _ x \ / - - - - - - - w -w- - - w c - -� w \ w \ w 10 LF _� 79,,-LF _ _ _ �,_!_ _P_,_ _ w _ �84 LF w w V-- � - -- - - � - - w\ / w 84 LF w 10 LF !� _ w_ 191 LF x w ¢ 90 LF w 10 LF `° w w w �,� �`-� 195 LF ,_ � �_� w w �! /wV,_ 95 LF w10 LF w w 163 LF w w w \ / V. w w 92 LF 10 LF i w " 66 LF w w w 37 LF - i` 10-LF 32 LF 82 LF _ _ 10 LF w 61 LF_ _ 32 LF w 10 LF _~� 32 ` l I I 0--w - - - � _ w w _ _ �, _ _ U.. w� - - V -6- - - � w w w w w w w w w w �� 32 LF 2120 PROPOSED FOREBAY #6 PROPOSED PROPOSED - CI #19 CI #20 PROPOSED STORMWATER BIO-RETENTION CELL "B" SCALE 1 " = 40' •- A •' LAYER • SOIL MEDIA • 0 I I I I I L,I • I_� MEDIA MIX THE MEDIA SHOULD BE COMPOSED OF A HOMOGENOUS MIX OF THE FOLLOWING: a. 75-85% MEDIUM TO COURSE WASHED SAND b. 8-10% FINES (SILT AND CLAY); AND c. 5-10% ORGANIC MATTER (SUCH AS PINE BARK FINES) MINIMUM MEDIA DEPTH ALL CELLS WITH TREES AND SHRUBS: 36 INCHES CELLS WITHOUT TREES AND SHRUBS: WITH NO IWS: 24 INCHES WITH IWS: 30 INCHES MEDIA P-INDEX LESS THAN 30 IN NSW WATERS LESS THAN 50 ELSEWHERE MEDIA MAINTENANCE MAINTAIN MEDIA SUCH THAT INFILTRATION RATE IS AT LEAST 1 IN/HR CONSTRUCTION SEQUENCE: 1.) DO NOT ALLOW FLOW INTO 810-RETENTION CELL UNTIL SITE IS STABILIZED. (PAVED / GRASS) 2.) CLEAN OUT CELL IF USED AS A SEDIMENT BASIN DURING CONSTRUCTION. 3.) INSTALL 8" LAYER OF STONE, UNDERDRAINS. 4.) INSTALL FILTER FABRIC, 4" WASHED SAND AND SOIL MEDIA. 5.) INSTALL 4- LAYER OF TRIPLE SHREDDED HARDWOOD MULCH IN ENTIRE CELL. PROPOSED OUTLET #3� tffffftffffffftfttf PROPOSED LEVEL SPREADER #2 F - - - -- PROPOSED STORM DRAIN DISCHARGE LINE 10yr STORM DETENTION PONDING ELEV. = "G" -9" OPENING (INSTALL TRASH RACK/SCREEN ON OPENINGS) ELEV. = "A" TOP OF OCS #11 (OVERFLOW STRUCTURE) W/ MANHOLE 10' RING AND LID PRECAST FLUSH INTO TOP I� AS NOTED ON FOREBAY DETAIL 9" RIP RAP (SEE RIP RAP"XI ENERGY & VELOCITY DISSIPATER SECTION FOR ADDITIONAL DETAILS) BIO-RETENTION CELL FOREBAY WEIR SECTION N.T.S. BERM TOP ELEV. = "F" 9" RIP RAP (SEE EMERGENCY SPILLWAY ENERGY & VELOCITY DISSIPATER ELEV. = "I" SECTION FOR ADDITIONAL DETAILS) 810-RETENTION CELL EMERGENCY SPILLWAY SECTION N.T.S. ................ ;.................. I JlI ICI I• INV. ELEV.= "E" PROPOSED 30" HDPE (WTJ) STORM DRAIN TO OUTLET #3 LINE ® 0.73% (LEVEL SPREADERC 77 7 I 7 74-IImo- 7 I-7rl I7 -I I•I iTi •i 1T�i i• i, II IIIIIIIIII IIII INVERT OF OTCB it ITrI l III III III III III III III III - (INTERIOR OF BOX) ELEV. = "H" it 24" 1 on -' "-- TO 12" BELOW )ISCHARGE '*-- 9" d50 STONE (RIP RAP) RIP RAP ENERGY & VELOCITY DISSIPATER SECTION NOT TO SCALE 1310-RETENTION CELL TABLE CELL # ELEV. "A" ELEV. "B" ELEV. "C" ELEV. "D" ELEV. "E" ELEV. "F" ELEV. "G" ELEV. "H" ELEV. "I" # OF CLEANOUTS Wq VOLUME REQUIRED Wq VOLUME PROVIDED B 2118.00 2118.00 2117.00 2116.00 2115.16 2120.00 2118.32 2110.50 2119.00 40 27,409 CIF 39,330 CF / / / / 12" HIGH RIP RAP ENERGY & VELOCITY W/ FILTER STONE -k PROPOSED 9" d50 STONE RIP RAP EXTENDED TO ELEV. 2118' I PROPOSED OUTLET/#9 1 PROPOSED CI #18 PROPOSED FOREBAY ##5 SCALE 1 " = 20' 12" HIGH RIP RAP ENERGY & VELOCITY W/ FILTER STONE - V_ V_ �-'-'♦ of 51' PROPOSED 9" d50 STONE RIP RAP EXTENDED TO ELEV. 2118' PROPOSED OUTLET #10 CI #19 I PROPOSED FOREBAY ##6 SCALE 1 " = 20' NOTES: 1.) OVERFLOW STRUCTURE SHALL HAVE STANDARD STEPS, 16" ON CENTER PRECAST INTO BOX DIRECTLY BELOW MANHOLE ACCESS AND NOT LOCATED ON SIDE OF BOX THAT HAS AN ORIFICE OR THE OUTLET PIPE. 2.) IN -SITU SOIL MUST NOT BE COMPACTED BY EQUIPMENT. 3.) CELL BOTTOM SHOULD BE SCARIFIED PRIOR TO CELL MATERIAL INSTALLATION TO PROMOTE INFILTRATION. 4.) THE MAXIMUM SIDE SLOPES FOR THE INSIDE OF THE 810-RETENTION CELL SHALL BE 3:1. (ELEVATION "F" TO ELEVATION "C") 5.) BIO-RETECTION CELL SHALL BE MULCHED AND PLANTED W/ TREES AND SHRUBS (SEE LANDSCAPING PLAN FOR PLANTINGS). 6.) HDPE PIPING LEAVING OCS SHALL HAVE WATER TIGHT JOINTS. 7.) OCS #11 SHALL BE A MIN. OF 5'x5' PRECAST CONCRETE BOX. KNOCK OUT PANELS (WAFFER BOX) SHALL NOT BE ACCEPTABLE. A MANHOLE RING AND LID SHALL BE PRECAST FLUSH INTO TOP OF LID. 8.) SOIL MEDIA SHALL EXTEND BENEATH THE ENERGY DISSIPATING DEVICE (FOREBAY) INSIDE BIO-CELL. 9.) TRASH RACK SHALL EXTEND FROM INVERT OF OCS OPENING WEIR TO INVERT OF TOP. TRASH RACK SHALL NOT HAVE ANY OPENINGS GREATER THAN 54" IN ANY DIRECTION AND SHALL BE MADE OUT OF A NON -CORROSIVE METAL MATERIAL W/A MIN I"• (REBAR IS NOT ACCEPTABLE). 10.) THE BIO-RETENTION CELL MEDIA SHALL BE MAINTAINED IN A MANNER THAT RESULTS IN A DRAWDOWN OF AT LEAST ONE INCH PER HOUR AT THE PLANTING SURFACE. 11.) IMPERMEABLE LINER SHALL BE EXTENDED TO ELEVATION "C- IN THE BIO-RETENTION CELLS. • PATH V CONCRETE• • • 'NVERT ELEV. OF CONC. CHANNEL = • : • • STONE 12" WIDE J SECTION "A"VIEW CURB FOOTER NOT TO SCALE FLOW _ PATH I1= 8' 12„ 12" LAYER OF 12" STONE INV. OF TOP OF STONE _ 114' j IN 21INVERT00F CHANNEL 200 Ib TENSILE STRENGTH FILTER FABRIC SECTION "B" VIEW 12" WIDE NOT TO SCALE CURB FOOTER 12" LAYER OF 9" STONE TOP OF CURB (3 FT WIDE) ELEV. 2104.0' -i i I-111-- 18 a.. - 3 FT. WIDE STRIP 12 OF FILTER FABRIC CONCRETE DETAIL NCDOT CURB NOT TO SCALE STD. 846.01 8" X 18" W/ FOOTER 12" LAYER OF 9" STONE (3 FT WIDE) - 3 FT. WIDE STRIP OF FILTER FABRIC NCDOT CURB STD. 846.01 8- X 18" W/ FOOTER NOTES: 1.) BOTTOM WIDTH SHALL BE 24" W/ 3:1 SIDE SLOPES. 2.) 122 LF LEVEL SPREADER LENGTH. 3.) EXTEND CONCRETE CURB LEVEL SPREADER AROUND END FOR 10' (LENGTH NOT INCLUDED IN NOTE #2). 4.) EXTEND CONCRETE CURB UP AND AROUND OUTLET #3 AS TO DIRECT FLOW INTO LEVEL SPREADER AND OVER CONCRETE CURB PRIOR TO BYPASSING AROUND CONNECTION TO FES. NCDOT CURB STD. 846.01 8- X 18- W/ FOOTER PROPOSED LEVEL SPREADER #3 DETAIL NOT TO SCALE PIPE END SECTION WGLA ENGINEERING, PLLC 724 5th AVENUE WEST HENDERSONVILLE, NC 28739 (828) 687-7177 WGLA.COM NC LICENSE P-1342 Suncap Warehouse Town of Mills River Henderson County North Carolina CAR ,00 o0oo, �� o I ti °a - - - 07CO3,K21 q8 11D... oo - o o/ oN oo o,clN.000 < AM R 5/2021 REVISIONS DATE DESCRIP11ON • V Know what's below. Call before you dig. PROJECT NUMBER: 20176 DATE: 4/21 DRAWN BY: KHC CHECKED BY: WRB Bio-Retention Cell "B" C-303 SCALE: As -Noted -On -Sheet